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SHAREHOLDERS' EQUITY AND SHARE-BASED COMPENSATION - Market-based options vesting prices (Details)
Dec. 31, 2016
$ / shares
shares
Ordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 129,513
Market-based options, weighted average share price (in dollars per share) | $ / shares $ 50.32
Extraordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 106,518
Market-based options, weighted average share price (in dollars per share) | $ / shares $ 48.13
$40.01 — $50.00  
Market prices for market performance options to vest  
Market-based options, vesting price, low end of range (in dollars per share) | $ / shares 40.01
Market-based options, vesting price, high end of range (in dollars per share) | $ / shares $ 50.00
$40.01 — $50.00 | Ordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 14,500
$40.01 — $50.00 | Extraordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 0
$50.01 — $60.00  
Market prices for market performance options to vest  
Market-based options, vesting price, low end of range (in dollars per share) | $ / shares $ 50.01
Market-based options, vesting price, high end of range (in dollars per share) | $ / shares $ 60.00
$50.01 — $60.00 | Ordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 47,129
$50.01 — $60.00 | Extraordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 16,483
$60.01 — $70.00  
Market prices for market performance options to vest  
Market-based options, vesting price, low end of range (in dollars per share) | $ / shares $ 60.01
Market-based options, vesting price, high end of range (in dollars per share) | $ / shares $ 70.00
$60.01 — $70.00 | Ordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 17,884
$60.01 — $70.00 | Extraordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 6,250
$70.01 — $80.00  
Market prices for market performance options to vest  
Market-based options, vesting price, low end of range (in dollars per share) | $ / shares $ 70.01
Market-based options, vesting price, high end of range (in dollars per share) | $ / shares $ 80.00
$70.01 — $80.00 | Ordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 0
$70.01 — $80.00 | Extraordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 1,000
$80.01 — $90.00  
Market prices for market performance options to vest  
Market-based options, vesting price, low end of range (in dollars per share) | $ / shares $ 80.01
Market-based options, vesting price, high end of range (in dollars per share) | $ / shares $ 90.00
$80.01 — $90.00 | Ordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 0
$80.01 — $90.00 | Extraordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 25,467
$90.01 — $100.00  
Market prices for market performance options to vest  
Market-based options, vesting price, low end of range (in dollars per share) | $ / shares $ 90.01
Market-based options, vesting price, high end of range (in dollars per share) | $ / shares $ 100.00
$90.01 — $100.00 | Ordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 2,500
$90.01 — $100.00 | Extraordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 8,943
$140.01 — $150.00  
Market prices for market performance options to vest  
Market-based options, vesting price, low end of range (in dollars per share) | $ / shares $ 140.01
Market-based options, vesting price, high end of range (in dollars per share) | $ / shares $ 150.00
$140.01 — $150.00 | Ordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 12,500
$140.01 — $150.00 | Extraordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 1,250
$170.01 — $180.00  
Market prices for market performance options to vest  
Market-based options, vesting price, low end of range (in dollars per share) | $ / shares $ 170.01
Market-based options, vesting price, high end of range (in dollars per share) | $ / shares $ 180.00
$170.01 — $180.00 | Ordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 12,500
$170.01 — $180.00 | Extraordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 0
$180.01 — $190.00  
Market prices for market performance options to vest  
Market-based options, vesting price, low end of range (in dollars per share) | $ / shares $ 180.01
Market-based options, vesting price, high end of range (in dollars per share) | $ / shares $ 190.00
$180.01 — $190.00 | Ordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 0
$180.01 — $190.00 | Extraordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 23,375
Over $190.00  
Market prices for market performance options to vest  
Market-based options, vesting price, low end of range (in dollars per share) | $ / shares $ 190.01
Over $190.00 | Ordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 22,500
Over $190.00 | Extraordinary performance grants  
Market prices for market performance options to vest  
Market-based options, options expected to vest (in shares) 23,750